Simulating evolution in cement microstructure during chemical degradation

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Abstract

Calcium leaching is one of the important degradation mechanisms causing dissolution of the crystalline phases such as, AFm, portlandite increasing capillary porosity. Further it leads to decalcification of an amorphous C-S-H phase causing increase in the gel porosity and in turn degrading the long term performance of concrete structures. In this paper a lattice Boltzmann based pore-scale reactive transport approach in the context of simulating the evolution of microstructure of a hardened cement paste during calcium leaching is presented. This approach is based on fundamental principles of chemical thermodynamics and mass transport. The example presented illustrates influence of location of mineral grains and surface area on overall dissolution rate and pore structure evolution.

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Original languageEnglish
Title of host publicationProceedings of The 10th fib International PhD Symposium in Civil Engineering
Place of PublicationCanada
Pages173-178
Publication statusPublished - Jul 2014
Event10th fib International PhD Symposium in Civil Engineering - Université Laval, Québec, Canada
Duration: 21 Jul 201423 Jul 2014

Conference

Conference10th fib International PhD Symposium in Civil Engineering
CountryCanada
CityQuébec
Period2014-07-212014-07-23

Keywords

  • cement microstructure, chemical degration, lattice Boltzmann, reactive transport

ID: 326128